They have been skating __________.
#40389
A
for three hours
B
since three hours ago
C
three hours ago
D
since three hours
推荐题目
Tony          TV when his mother came in.
#39557
A
watch
B
watches
C
was watching
D
is watching
 Three bridges ________ over the river five years ago.
#36293
A
built
B
build
C
were built
D
are built
------Where is your father?------He _______ Shanghai. He has ______ there for a week.
#39850
A
has gone to, gone
B
has been in, gone
C
has gone to, been
D
has been to, been